MATLAB: How to find global mean,variance and mean of minimum pixels ???

digital image processingimage processingImage Processing Toolboxthresholding

I am using these statistics parameters for preprocessing in biometric ….i am unble to find any code or algorithm, please help me.

Best Answer

Use mean2 and var

theGlobalMean = mean2(yourGrayImage);
theVar = var(double(yourGrayImage(:)));

I don't know how you define the "mean of minimum pixels". What are the minimum pixels? If I knew that, I'd just pass them into mean() or mean2().

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For example, if you want sliding means and stds in all 3x3 neighborhoods

slidingmean=conv2(A,ones(3)/9,'same');
slidingstd=stdfilt(A);

or if you don't have the Image Processing Toolbox

 slidingstd=sqrt( conv2(A.^2,ones(3)/9,'same') - slidingmean.^2 );

MATLAB: How to split a gray image into dark, middle and bright pixels

You would have to know the algorithm they're using because there are quite a few gray levels that seem to be in all three classes. I think there is quite a bit of overlap in what they call dark, middle, and bright.

Best Answer

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